i also contemplated using paypal, but remembered hearing something bad about paypal in the past couple years. i did a bit of research and came across this website:
http://www.paypalwarning.com/ . after reading a few things on there, i decided against paypal for a number of reasons (not just because of all the horror stories on the website).
i found a link on a website (tho i can't find the address for that website) for transferring 1-999GBP that was recommended by the UK Inland Revenue. I registered with the recommended website at
http://www.moneybookers.com/app/ but have yet to transfer any money using their service. their website says that their fees are relatively low, but i don't know if they use the best conversion rate.
my UK bank also said that they would do a wire transfer for about 20 quid, but didn't know what the fee would be on the receiving end in the US for converting from GBP to USD. but since i am only going to be transferring 100-200 quid at a time, $40 in fees is quite a big chunk.